Well, more emphasis on the BOMB part, as I want there to be something of a dangerous, destructive element to him. Like, reason for someone to say, "Put him in a vacuum-sealed, claustrophobic environment in the middle of space? With us? Are you crazy?"
A fun little idea I just thought of: the Achenarans actually managed to find a psychic and wanted to experiment on them to see how to make their troops psychers. The psychic in question didn't take kindly to that idea, and evaporated an entire city. They haven't messed with psychics since.